import numpy as np
import matplotlib.pyplot as plt

x = np.arange(-5, 5, 0.1)
y = np.arange(0, 20, 0.2)

xx, yy = np.meshgrid(x, y)
z = np.square(xx) - yy > 0
print(z)
plt.contourf(xx, yy, z, cmap="cool")
plt.scatter(xx, yy, c=z)
plt.show()
